Installation; General Safety Precautions; Checking The Impeller Rotation Direction; Installing The Float Switch Control System - Zenit UNIQA Manual De Primera Instalación

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3. INSTALLATION

3.1 General safety precautions

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Fence off the working area by appropriate means and wear personal protection equipment.
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Before carrying out any operation, make sure that the pump and electrical panel are disconnected from the electrical mains and cannot be
accidentally powered up.
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Check the electric cable and gaskets for damage and make sure that the impeller turns freely.
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The size of the tank in which the pump is installed must be such that:
- any level float switches are able to move freely;
- the number of pump switch on/switch off cycles does not exceed the permitted number stated in the technical information;
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The pump must be lowered into the tank using a sling or chain of suitable size tied to the handle.
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Prior to installation, make sure the tank bottom is even.
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To prevent the cavitation problems caused if the pump draws in air, ensure that the liquids do not flow into the tank near to or towards the
pump.
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Make sure that the pump does not operate off its characteristic curve.
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Bolts used for replacement must be Class A2-70 or better according to EN ISO 3506-1
Make sure that the atmosphere in the working area is not potentially explosive.
Persons must not enter the installation area when the atmosphere is explosive.
The classification of the installation site must be approved by the local fire-fighting
autorities in each individual case.
The shock from built up electrostatic charges on isolated components could cause
an explosion. -Ex pumps do not have isolated components that are electrostatically
chargeable and they are all equipped with screw for connection to the equipotential
ground network (Fig. 8). Any additional components installed in the hazardous area
must be connected to the earthing network according to the EN 1127-1 rule.
Check the suitability for use in potentially explosive atmospheres of each additional
component installed in the hazardous area.
Prior to installation, check the oil level in the mechanical seals oil chamber.

3.2 Checking the impeller rotation direction

Before making the definitive electrical connection, a skilled technician must make sure the impeller rotation direction is correct.
The pump carries a decal which indicates the correct impeller rotation direction (green arrow) and the relative kickback direction (red arrow)
when the pump is viewed from above (Fig. 3B).
All of the following operations should be carried out in a secure place, in absence of potentially explosive atmospheres; if this
is not possible, you must carry out the testing with a device which controls the sequence phases installed inside the electric
panel.
Proceed as follows:
1. Take the precautions detailed in the "Safety Precautions" manual.
2. Place the pump vertical on its feet or base.
3. Secure the pump by tying a suitably sized chain or sling to the handle on the top to prevent it from falling over after the kickback.
warning!
The kickback may be very strong. Do not stand close to the pump during the procedure.
4. Temporarily connect the yellow-green wire to the system ground connector and then connect the power supply wires to the contactor.
5. Make sure there are no people or objects within a distance of at least 2 metres of the pump.
6. Operate the start switch, power up the pump for a few seconds and then shut off the power by flicking the stop switch.
7. Check that the rotation direction is correct.
If the pump is rotating in the wrong direction, invert two of the pump's three power supply phases and try again, repeating the procedure descri-
bed.
Once the connection which provides the correct rotation direction has been obtained, MARK the precise order in which the wires have been
connected to the system, DISCONNECT the power supply wires from the pump and proceed with definitive installation.
warning!
If more than one pump is connected to a single control panel, the rotation direction must be checked individually for each
unit installed.

3.3 Installing the float switch control system

Float switches allow one or more pumps to be started and stopped in response to the level of liquid in the tank.
They can also be connected to alarm devices to prevent operational problems (overflow or dry running).
They must be installed well away from turbulence or inflows of water.
In the event of strong turbulence, float switches should be installed on a rigid rod mounted inside the pit.
Make sure that there are no items which may obstruct movement of the floats and that the wires do not interfere with each other, and cannot
become tangled or trapped on projections inside the tank.
Float switches must be installed in such a way that the correct minimum liquid level is guaranteed.
(Fig. 9)
First installation manual – Translation of original instructions
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EN
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